Yes, this. But "would you like to know which of these people are your first cousins?" or "do you need contact iformation for any of your relatives?" are different from "would you like a list of relatives in priority order?"

As a practical matter, they should probably wait until they know whether this is even a question: how many relatives do the son and his intended plan to invite? There's no point getting into an argument about whether the people getting married can invite only some of their aunts, if they have already decided not to invite any.